As ever, no M3W experience, though had a few m/cycles and well know the thinking behind oil draining through the oil pump over time causing it to build up in the crankcase, and the possibility of putting pressure on the crankcase seals on start up.
With seldom used vehicles that are garaged after a run when the oil is warm, there may be many weeks or months of storage for that oil to drain from vital components, and valve gear it likely to have been the hottest when initially laid-up, and perhaps the most likely to suffer a degree of oil drainage before much else..? The sound of an engine rattling until the oil pressure builds is I suspect very uncomfortable for the mechanically inclined.
The idea of avoiding generating sparks and spinning the engine over is one I have used over many years, as it excercises a lot of kit from the battery onwards...I suspect machinery and associated systems are not designed for long term lay-up..and those that are generally have oil priming as part of the start up sequence..
